Aeroplane-rudder.



J. R. FROBERG.

EROPLANE RUDDER.

APPLIOATION HLBD JUNE 12, 1912.

Paented Mar. 18, 1913.

INVEYUJOR @fran asy BY f-Unrrnn strains rarer ernten.

JOHAN RICHARD FBOBERGpGF RICHMOND, CALIFORNIA.

Annemarie-numana.

Application filed June 12,

To all whom it may concern:

Be itknow'n that I, JOHAN RIcHARD Faofnnogacitizen of the United States, residing at Richmond, in the county of Contra Costa and State'o California, have' invented new and useful Improvements in 'Aeroplane- Rudders, of which the following is a specilication.

This invention relates to aerial apparatus,

io and particularly to a rudder for aeroplanesA Theobject of the presentinvention is to provide an improved horizontal steering and vertical elevating rudder of unitary substantial construction; said rudder being composed of a main elevating plane and a rpendicularly arranged horizontal steer- `ina construction. Figure l is a plan view showing the fuselage oan' aeroplane with the rudderA attached. F ig. 2 is a front elevation of the rudder partly in section. Fig. 3 is an end view othe rudder. Fig. 4 is a plan view of the ruddenchair. Fig. 5 is a detail showing the rudder and elevator'operating devicek Fig. 6 is an edge view of the same. Fig. 7 is an edge viewot a double pulley block. Fig. 8 is a detail of the elevator clevis.

In the present instance I have shown a fuselage 2 oithe top of the aeroplane in 3G .which is provided an aviator-s saddle 3, ad-

' acent towhich is pivoted at 4 a lever the ower vend'of which is connected by a cable G running around a' guide 'or direction sheave 7 to .an elevator 8. This elevator 1s of a suitable transverse section-and of appropriate length and width, and is pivoted upon trunnions 9 for transverse oscillation; the trunnions bein provided in a chair 10 which pneferab y is olight, but substantial frame work, a portion of which is suitably transversel braced :adjacent its center by bar 11, which is pivoted upon a vertical axis or bolt 12 mounted in the fuselage 2.

rThe chair 10 is'- adapted for oscillation about its vertical axis 12and may be so oscillated by means of" suitable cables or flexii ble connections 13,' which extend'forwardly from the chair 10 and are wound upon a steering wheel 14 which is pivoted in the uplper end of the elevator operating lever 5. T

e lead wires or cables 13 are preferably crossed below the steering wheel 14 and travel around sheaves `15, thence running downwardly to and around guide sheaves 16 `Specication of Letters Patent. i Pamd Bling, 18, 1913,

1912. serial no. 703.180.

from which the connections run backwardly to and connect with the chair 10.

lVlien lthe operator wishes to turn the chair angularly relative to the fuselage 2, la

turn of the steering wheel 1st edects a pull on one of the connections 13, the consequence of which is thechair will be oseillated in one direction or another, thus presenting to the air suitable blades 417 which are secured to the elevator 8 perpendicu-- larly, the blades '17 forming the rudders accomplishing the horizontal steering of the aerial vessel. Since the horizontal steering rudders 17 are rigidly connected to the ele vating device 8. it is manifest that the steering eiiciency of theperpendicular planes 17 remains the saine, irrespective of the angle of incidents to whichl the elevator 8 may bev 'the elevator lever 5, is connected by a peculiar clevis 20 having double lhooks as 21 from which lead strandsv 22 which run around suitable direction guides 23,' thence being continued upward and transversely as at 24' and through a block 25, in the lower part of which is provided a pulley. 26 onv which 'the transverse strands 24 travel.

The block 25 is-provided with anupper pulley 217, beneath which runs a strand 28 diverging upwardly and connecting to convenient -points on the elevator 8. By this construction, when the elevator operating lever 5 is tilted about itsv :tulcrum el, the operating cable 6 draws, for instance, on the upper stretch, to which is connected a clevis 20, this resulting in pulling downwardly'-A the block' 25 and through this drawing down the front edge of the elevator 8;

meanwhile the lower stretch of the cablej' is released or slackened, thus permitting an-- other clevis 20 to slack up respective strands 30 which are. connected to a block 31. at the rear edge of the elevator 8. When the operator has adjusted the lever 5 to -1ob,

tain the desired angle of the elevator, the steeringv wheel 14: may then be actuated to 

